05000368/LER-1980-085-03, /03L-0:on 801111,core Protection Calculator (CPC) a Link Failed.Caused by Data Link Failure Between CPC Channel & Operator Console.Data Link Card Replaced & Bypasses Removed

/03L-0:on 801111,core Protection Calculator (CPC) a Link Failed.Caused by Data Link Failure Between CPC Channel & Operator Console.Data Link Card Replaced & Bypasses Removed

ML19354C397
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/09/1980
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19345D423	List: 05000368/LER-1980-085, Forwards LER 80-085/03L-0 05000368/LER-1980-085-03, /03L-0:on 801111,core Protection Calculator (CPC) a Link Failed.Caused by Data Link Failure Between CPC Channel & Operator Console.Data Link Card Replaced & Bypasses Removed
References
LER-80-085-03L, LER-80-85-3L, NUDOCS 8012150088
Download: ML19354C397 (1)

LER-1980-085, /03L-0:on 801111,core Protection Calculator (CPC) a Link Failed.Caused by Data Link Failure Between CPC Channel & Operator Console.Data Link Card Replaced & Bypasses Removed

Event date:
Report date:
3681980085R03 - NRC Website

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NRC FORM 366 U. S. NUCLE AR REGUL ATORY COMMISSION LICENSEE EVENT REPORT EXHIBIT A CONTROL SLOCK: l l l l l 1 Ih (PLE ASE PRINT OR TYPE ALL REOutRED INFORMATION) l AlR l Al Nl 0 l 2 lg,l 0 l0 l -l0 l 0 l 0] Oj 0 l-l 0 l0 lgg l1 l 1 l1 l 1lg[ ul,.lg o i

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EVENT DESCRIPTION AND PROBASLE CONSEQUENCES io i 21 I uring Mode 1 operation, the "A Core Protection Calculator (CPC) failed. i D

Lo_LJ IThe DNBR/LPD trios were by-Dassed on the "A" CPC channel Der Action #2 of _1 lT.S. Table 3.1-1, placing the reactor trip logic in a two out of three tria o.

inisiisequence.

The "B", "C", and "D" channels remained operable. Similar to I ILER 50-368/79-096 (Channel "C") and 79-075 (Channel "B").

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CAUSE DESCRIPTION ANO CORRECrivE ACTIONS h siioi i Investigation revealed cause of CPC failure to be a data link failure i

tii,ii between the CPC channel and the CPC operator console. The defective datai Ilink card was_ replaced.

The bypasses were removed and the CPC channel i

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